@import url('https://fonts.googleapis.com/css?family=Nunito+Sans');

:root {
  --blue: #39a6b9;
  --white: #fff;
  --green: #36e6da;
}

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Nunito Sans';
  color: var(--blue);
  font-size: 1em;
  background-image: url('https://www.notion.so/images/page-cover/nasa_robert_stewart_spacewalk_2.jpg');
  background-size: cover;
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}

button {
  font-family: 'Nunito Sans';
}

ul {
  list-style-type: none;
  -webkit-padding-start: 35px;
  padding-inline-start: 35px;
}

svg {
  width: 100%;
  visibility: hidden;
}

h1 {
  font-size: 7.5em;
  margin: 15px 0px;
  font-weight: bold;
}

h2 {
  font-weight: bold;
}

.btn {
  z-index: 1;
  overflow: hidden;
  background: transparent;
  position: relative;
  padding: 8px 50px;
  border-radius: 30px;
  cursor: pointer;
  font-size: 1em;
  letter-spacing: 2px;
  -webkit-transition: 0.2s ease;
  transition: 0.2s ease;
  font-weight: bold;
  margin: auto;
  margin-left: 15px;
}
.btn.green {
  border: 4px solid var(--green);
  color: var(--blue);
}
.btn.green:before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 0%;
  height: 100%;
  background: var(--green);
  z-index: -1;
  -webkit-transition: 0.2s ease;
  transition: 0.2s ease;
}
.btn.green:hover {
  color: var(--white);
  background: var(--green);
  -webkit-transition: 0.2s ease;
  transition: 0.2s ease;
}
.btn.green:hover:before {
  width: 100%;
}

@media screen and (max-width: 768px) {
  body {
    display: block;
  }

  .container {
    display: flex;
    justify-content: center;
    align-items: center;
  }
}
